Re: [PATCH] Use a table to dispatch IO requests in kvmctl

[Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

On Tue, 2007-10-09 at 16:40 -0500, Anthony Liguori wrote:
> This patch attempts to clean up kvmctl so that it can be more easily made to
> work for multiple architectures and to support more emulation.
> 
> It introduces a io dispatch mechanism.  This mechanism supports subpage
> granularity but is optimized to efficiently cover regions of pages too.  It's
> a 64-bit address space that's structured as a 5-level table.

> For x86, we'll have two tables, a pio_table and an mmio_table.  For PPC we can
> just have a single table.  The IO functions can support accesses of up to 8
> bytes and can handle input/output in the same function.
> 
> I tried to keep this nice and simple so as to not add too much complexity to
> kvmctl.

I'm having a hard time seeing how this range stuff is useful.

Other than that, a 5-level table sounds like overcomplicating something
where a plain old hash table would do just fine, but it's only one
function so I guess I can't complain much.

-- 
Hollis Blanchard
IBM Linux Technology Center


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